Scot. The ironwork on the frame and box of a wooden hutch. Fay
The fine, heavy materials that pass through the meshes of the screen in a
jig. Newton, 1
a. A road through a mine. Standard, 2
b. Scot. A hutch tramway. Fay
In mineral processing, the concentrates passing down through the ore jig
into the hutch. Pryor, 3
A very rare, strongly radioactive, colorless to pale cream, monoclinic
mineral, ThSiO4 , found in sands and gravels with scheelite,
cassiterite, uranothorite, zircon, ilmenite, and gold. Crosby
This machine comprises a number of horizontal rotating flight bars working
near the floor of the seam and driven through gearing by an electric
motor. These bars push into the coal in their extended position and are
almost completely concealed inside the loader casing in their retracted
position. They push prepared coal up a ramp on to a low, bottom-loaded
conveyor belt. The machine is hauled along the face by means of two steel
ropes wound on separate drums on the loader; one rope passes up the front
of the coal and is held by means of an anchor prop; the other rope is
threaded under the cut coal by means of a threader pipe attached to the
rear of the coal cutter. Lengths of rope equal to the drum capacity are
joined by figure-8 links and are detached and unwound from the drum as the
loader proceeds along the face. Mason
A cutter-loader based on the plow principle and designed to cut coal that
is too hard for the ordinary plow. Two vertical blades, fitted one at each
end of the machine, carry cutting picks that shear the coal from the face
by an oscillating motion. The machine is hauled backward and forward along
the face by a chain haulage mounted on the tail end of the conveyor. The
conveyor and slicer are held up to the coal by pneumatic rams spaced along
the goaf side of the conveyor. The sheared coal is forced from the face by
the wedge shape of the machine and is loaded on to the armored conveyor by
means of specially shaped ramps. The machine has been designed for seams
with a minimum thickness of 4 ft (1.22 m) and has a maximum cutting depth
of 14 in (35.56 cm). Syn:activated plow
A very general principle applying to all forms of wave motion that states
that every point on the instantaneous position of an advancing phase front
(wave front) may be regarded as a source of secondary spherical wavelets.
The position of the phase front a moment later is then determined as the
envelope of all of the secondary wavelets (ad infinitum). This principle
is useful in understanding effects due to refraction, reflection,
diffraction, and scattering, of all types of radiation, including sonic
radiation as well as electromagnetic radiation, and applying also to ocean
wave propagation. Hunt
Letter name specifying the dimensions of bits, core barrels, and drill
rods in the H-size and W-group wireline diamond drilling system having a
core diameter of 76.2 mm and a hole diameter of 99.2 mm. Syn:HX
Cumming, 2
Letter name specifying the dimensions of core, core barrels, and casing in
the H-size and X-series wireline diamond drilling system having a core
diameter of 76.2 mm and a hole diameter of 99.2 mm. The HX designation for
coring bits has been replaced by the HW designation. Syn:HW
Cumming, 2
A red-orange variety of zircon; also applied to similarly colored garnet,
quartz, and other minerals. Syn:cinnamon stone; essonite; jacinth.
a. Sometimes used as a prefix ("hyalo-") to names of volcanic rocks with a
glassy texture, e.g., hyalobasalt. AGI
b. Said of a mineral that is amorphous. AGI
A variety of globular or botryoidal opal that shows greenish-yellow
fluorescence under ultraviolet light and can be mistaken for
uranium-bearing minerals such as autunite. Syn:glass opal; water opal.
A prefix meaning glassy. AGI
Said of the texture of a porphyritic igneous rock in which crystals and
glassy groundmass are equal or nearly equal in volumetric proportions, the
ratio of phenocrysts to groundmass being between 5:3 and 3:5.
Syn:semicrystalline; hemicrystalline. AGI
A monoclinic or triclinic mineral, 4[(K,Ba)Al(Si,Al)3 O8 ] ;
feldspar group, intermediate in the series orthoclase-celsian; prismatic
cleavage; in manganese ore deposits, or veins and pegmatites.
Said of the texture of an igneous rock in which the mesostasis is glassy
and makes up a proportion of the rock intermediate in texture between
hyalophilitic and hyalocrystalline. CF:intersertal
A process used for refining of crude nickel anodes. These are placed in
reinforced concrete tanks lined with asphalt. The nickel anodes are
dissolved electrochemically and the impurities, such as copper and iron,
pass into solution. The cathodes are surrounded by bags of closely woven
canvas duck, fastened on wooden frames, and pure nickel electrolyte is
passed continuously into them to maintain a higher solution level inside
the cathode compartment than outside. By this means, the pure solution
flows through the pores of the bags, thus preventing the ions of copper,
etc., in the solution in the anode compartment from migrating into the
cathode compartment, depositing on the cathode, and preventing the
refining process from taking place. The electrolyte in the anode
compartments is drawn off continuously and is purified in the copper
cementation and iron precipitation departments before being returned to
the cathode compartments of the nickel deposition tanks. Osborne
a. Pertaining to a rock whose chemical composition is the result of
assimilation. AGI
b. A rock whose composition is the result of assimilation.
See also:hybridization
The process whereby rocks of different composition from that of the parent
magma are formed, by assimilation. See also:hybrid; assimilation;
contamination. AGI